A tip I picked up many years ago when I first started photography was to keep a uv filter on my lenses permanently.A uv filter does little to effect a photograph apart from limiting that annoying blue haze you can sometimes get on landscapes but it is an excellent lens protector and it’s far cheaper to replace a filter than it is a lens.I just bought a uv nd filter for my drone
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@Pondlife I currently use these from DJI 
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I have UV filters on my drones, as you say primarily for protection. Use ND filters sometimes for videos. But always with something over the lens !
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I have a set that came with the bundle,no doubt I’ll be making use of them in due course 
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